class CreateRelationships < ActiveRecord::Migration
  def change
    create_table :relationships do |t|
      t.integer :follower_id
      t.integer :followed_id

      t.timestamps
    end
    add_index :relationships , :follower_id
    add_index :relationships , :followed_id
    #isso reforça que a unicidade do par (seguidor,seguido)
    add_index :relationships , [:follower_id, :followed_id] , :unique=>true
  end
end
